What is Tranexamic Acid? A Scientific Guide to Spot and Melanin Control
Prepared by Pharmacist Berfin Işık. As a pharmacist and cosmetic science expert, she specializes in skincare ingredients. This content is for informational purposes only and is not a substitute for medical advice.
Tranexamic acid, long used as a pharmaceutical component in surgical bleeding, has become one of dermatology's most potent treatment options for hyperpigmentation and melasma in the last decade. In this guide, we explain what tranexamic acid is, how it works on the skin, what clinical evidence says, and how to use it according to your skin type, supported by scientific data.
What is Tranexamic Acid?
Tranexamic acid (TXA) is a synthetic analog of the amino acid lysine. It has been used for bleeding disorders since the 1960s. Its story in dermatology began in the 1990s when Japanese dermatologists noticed a striking improvement in melasma in patients using oral TXA.
How Does It Work on the Skin?
The anti-pigmentation effect of TXA is based on four complementary mechanisms:
- Plasmin inhibition: TXA blocks plasmin activity in keratinocytes, interrupting the UV-induced melanogenesis chain at its source.
- VEGF receptor targeting: It inhibits both angiogenesis and melanogenesis.
- Autophagy activation: It reduces the amount of melanogenesis-related proteins via the ERK signaling pathway.
- TGF-β1 pathway: It upregulates TGF-β1 expression in keratinocytes, thereby downregulating tyrosinase activity.
Effects on the Skin
| Effect | Description |
|---|---|
| Melasma reduction | Consistent efficacy proven in a meta-analysis covering 22 RCTs. |
| Post-inflammatory hyperpigmentation | Shown to be effective on acne scars and post-traumatic spots. |
| Skin tone evening | Decreases melanin index. |
| Alternative to hydroquinone | 2-5% TXA shows similar efficacy to hydroquinone with a better tolerability profile. |
Scientific Evidence
Hao et al.'s 2021 meta-analysis synthesized data from 22 RCTs and 1,280 patients, revealing that oral, topical, and intradermal TXA significantly reduced MASI and melanin index compared to placebo. Kim et al.'s histological evaluation study showed that TXA also reversed dermal vascularization and mast cell activation.
How to Use It?
Topical concentration is usually between 2-5%. Daytime routine: Cleansing → Toner → TXA serum/cream → Moisturizer → SPF 30+. Sun protection is an indispensable partner in TXA treatment.
Safe combinations: Shows synergistic effect with Niacinamide. The speed of spot reduction may increase with AHA/BHA.
Products at Medicblu
Theraderm De Mela Lightening Cream — Tranexamic Acid + Vitamin C + Arbutin + Glutathione.
MeLine Ethnic Skin Day — Tranexamic Acid + Glutathione + Phytic Acid, for darker skin tones.
Conclusion
Tranexamic acid is an ingredient that targets the melanin production chain through four different mechanisms, with similar efficacy to hydroquinone but a much better tolerability profile. Consistent use with sun protection will yield the fastest results.
Scientific References
- Hao Y, et al. Efficacy and safety of tranexamic acid in the treatment of adult melasma: An updated meta-analysis of randomized controlled trials. J Cosmet Dermatol. 2021. PMID: 33959984
- Kanechorn na Ayuthaya P, et al. Topical 5% tranexamic acid for the treatment of melasma in Asians. J Cosmet Laser Ther. 2012;14(3):150-154. PMID: 22506692
- Kim EH, et al. Effect of tranexamic acid on melasma: a clinical trial with histological evaluation. J Eur Acad Dermatol Venereol. 2012;26(9):1081-1088. PMID: 22329442
- Chen X, et al. Tranexamic Acid Inhibits Angiogenesis and Melanogenesis in Vitro by Targeting VEGF Receptors. Int J Mol Sci. 2020;21(8):2766. PMID: 32308543
- Feng X, et al. Tranexamic acid inhibits melanogenesis partially via stimulation of TGF-β1 expression. J Dermatol Sci. 2021;104(3):215-218. PMID: 34862827
- Tse TW, Hui E. Tranexamic acid: an important adjuvant in the treatment of melasma. J Cosmet Dermatol. 2013;12(1):57-66. PMID: 28748406
